The kan-extensions package

[ Tags: bsd3, comonads, data-structures, functors, library, monads ] [ Propose Tags ]

Kan extensions, Kan lifts, various forms of the Yoneda lemma, and (co)density (co)monads.


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Versions 0.1, 0.1.1, 0.1.2, 0.2, 0.2.1, 0.2.2, 0.5.0, 0.5.1, 1.8.0, 1.9.0, 2.0.0, 2.0.0.1, 2.0.0.2, 2.0.0.3, 2.0.1, 2.0.2, 2.1, 2.1.2, 2.2, 2.3, 2.4, 2.4.0.1, 2.5, 2.6, 2.7, 3.0, 3.1, 3.1.0.1, 3.1.0.2, 3.1.1, 3.1.2, 3.4, 3.5, 3.5.1, 3.6, 3.6.2, 3.7, 4.0, 4.0.1, 4.0.2, 4.0.3, 4.1, 4.1.0.1, 4.1.1, 4.2, 4.2.1, 4.2.2, 4.2.3, 5, 5.0.1, 5.0.2, 5.1
Change log CHANGELOG.markdown
Dependencies adjunctions (>=4.2 && <5), array (>=0.3.0.2 && <0.6), base (>=4.4 && <5), comonad (>=4 && <6), containers (>=0.4 && <0.6), contravariant (==1.*), distributive (>=0.2.2 && <1), fail (>=4.9 && <5), free (>=4 && <6), mtl (>=2.0.1 && <2.3), profunctors (==5.*), semigroupoids (>=4 && <6), tagged (>=0.7.2 && <1), transformers (>=0.2 && <0.6), transformers-compat (>=0.3 && <0.6) [details]
License BSD3
Copyright Copyright (C) 2008-2016 Edward A. Kmett
Author Edward A. Kmett
Maintainer Edward A. Kmett <ekmett@gmail.com>
Category Data Structures, Monads, Comonads, Functors
Home page http://github.com/ekmett/kan-extensions/
Bug tracker http://github.com/ekmett/kan-extensions/issues
Source repo head: git clone git://github.com/ekmett/kan-extensions.git
Uploaded Sun Jan 28 14:56:45 UTC 2018 by ryanglscott
Distributions Arch:5.1, Debian:4.2.3, Fedora:5.0.2, FreeBSD:4.2.2, LTSHaskell:5.0.2, NixOS:5.1, Stackage:5.1, openSUSE:5.0.2
Downloads 73238 total (644 in the last 30 days)
Rating 2.25 (votes: 2) [estimated by rule of succession]
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Status Docs available [build log]
Last success reported on 2018-01-28 [all 1 reports]
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Readme for kan-extensions-5.1

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kan-extensions

Hackage Build Status

This package provides tools for working with various Kan extensions and Kan lifts in Haskell.

Among the interesting bits included are:

  • Right and left Kan extensions (Ran and Lan)
  • Right and left Kan lifts (Rift and Lift)
  • Multiple forms of the Yoneda lemma (Yoneda)
  • The Codensity monad, which can be used to improve the asymptotic complexity of code over free monads (Codensity, Density)
  • A "comonad to monad-transformer transformer" that is a special case of a right Kan lift. (CoT, Co)

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.

-Edward Kmett